It's still a manual process, but it takes about 20 seconds to generate an Android Gradle project, build an apk, build a release apk, and push it with adb.

The next step would be connecting a form to it so everything is done automatically. Maybe push the app to Google Play through their API.

Edit: sorry if the site is a little buggy, threw this all up in a day or so.

Feedback appretiated, thanks, Yuri

It might be helpful to specify in the title that this is for converting website apps to Android apps.